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@oldturkey03 - I hear it would be on the mid 2012 macbook pro?
And do you know what pin(s) is/are for b, g, t, 5, -, and [?
I need to know before I fork over $50-75 to louis Rossman.
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Thank you for the help,
But it’s out of my skill set,
I’m sending it to Louis rossman.
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Well, it's hard to discern which pin is which based on the schematic on these since the only data you get from that is KB1-KB23 and keys that have their own pins like Caps Lock, Num Lock, power key, etc.... I would have to play around to figure out which pins relate to which keys otherwise.
I am inclined to agree with @oldturkey03 though, if you have an issue with these keys on a Mac of this age it's likely to be a keyboard issue rather than a board one.
crwdns2934105:0crwdne2934105:0
I would be willing to send it over to you,
And there is a a loose pin on the connector it seems,
So board problem...
@danj - Do you happen to know?
You know what I might just try to get my other broken board fixed,
It keeps clicking near the magsafe board
@beanman56 Oh got it. I was missing that part of the conversation. 😅
I'm not really set up to offer repairs to others, my interest is largely hobby, plus I already have two jobs. But if it's just one pin that's loose, as far as solder jobs go, there are much harder.
I also don't know if I have the equipment I would want to handle this job either. I have been looking at getting a less specific board heater (the one I have is intended for splitting apart iPhone boards). These plastic connectors don't always take well to getting blasted with hot air (it's a recipe for melted plastic, and nobody wants that). So a preheater would go far. Just haven't gotten around to it.
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@beanman56 - I would leverage a known good keyboard to trace out the which pins within the connector are shorted.
Remember, the keyboard is a simple X - Y grid. What makes is tough is locating the active horizontal and vertical lines effected as its not a simple 7 H by ~14 V line matrix.
oldturkey03 had placed the connector pinouts here, not sure why he took it away as you need it to reference the lines. I'll need to dig out a better diagram as the one within this systems schematics is not very good
Its been awhile since I've needed to debug a keyboard issue. Often its the keyboard its self or the ribbon cable connection to the logic board.
Rarely do I find a single line damaged. Here you have a single vertical line misbehaving (5 - T - G - B) not sure why you also have [ - ? effected as well I don't think they are within the same line.
My money is on a bad keyboard (spill or other junk) I would first replace it or the uppercase assembly.
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Already tested with other keyboards,
What I need is for someone to replace the connector…
@beanman56 - I doubt the connector is the issue.
More likely a bad solder joint. Are you very sure as the ZIF connector? Rarely does it fail unless forced (snapping off the latch)
I would stick use the keyboard to isolate out which line is bad as I explained.
@danj - AGAIN I doubt the 2 keyboards THAT PERFECTLY WORKED BEFORE failed somehow without using them.
@beanman56 - You'e over thinking it!
A glass that is half full, is also half empty!
The goal is to trace out the keyboard keys to which lines are used so you can ID which contact within the connector as well as the trace back to the decoder chip so you can follow the connections pathway.
My point was you need to have a known good keyboard to trace out with a simple continuity tester. I'm not looking over your shoulder so I don't know what you have on your desk.
So thinking out the grid is a collection of horizontal & vertical lines. So when you press a key you are pressing is shorting across these two. Finding these two lines when the 5 and the B key is pressed will give you one common vertical line and two distinctly different horizontal lines. The line in question is the vertical one.
@danj - SO now it sounds like the connector and the decoder chip are faulty.
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@beanman 56 The B,G,T,5 issue appear to be a keyboard issue not a logic board issue.
crwdns2934271:0crwdnd2934271:0 oldturkey03 crwdne2934271:0
Never mind, I found it.
820-3115-B
crwdns2934271:0crwdnd2934271:0 Ben Capehart crwdne2934271:0
@beanman56 you said you have a broken pin in the connector, that means you know which line is the one for your B,G,T,5 issue. Let us know which one it is and replace your connector. That way it is fixed and will work for you again, You are the one with the answer:-)
crwdns2934271:0crwdnd2934271:0 oldturkey03 crwdne2934271:0